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当前学科:血液系统疾病患儿的护理
题目:
单选
骨髓成为唯一造血场所的时间是()
A . A.胚胎第3周
B . B.胚胎第6周
C . C.胚胎第4~5个月
D . D.生后2~5周
E . E.生后4~5天
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